Search

CN-117259017-B - Flotation inhibitor for phosphogypsum whitening and upgrading as well as preparation method and application thereof

CN117259017BCN 117259017 BCN117259017 BCN 117259017BCN-117259017-B

Abstract

The invention discloses a floatation inhibitor for phosphogypsum whitening and upgrading, a preparation method and application thereof, wherein polysaccharide inhibitor and polymer inhibitor are firstly mixed with water, heated and dissolved, and then adding the mixture of the inorganic inhibitor, the small organic molecule inhibitor and the polyphenol inhibitor into the mixture, and stirring the mixture until the mixture is completely dissolved to obtain the compound flotation inhibitor. When the prepared flotation inhibitor is used for the flotation of phosphogypsum, the content of CaSO4.2H2O and the whiteness of the phosphogypsum can be obviously improved, the content of SiO2 is reduced to about 0.5%, the purity and recovery rate of the phosphogypsum are obviously improved, the loss of phosphorus resources is reduced, the resource utilization of the phosphogypsum is facilitated, and the stacking pressure is reduced.

Inventors

  • YONG QING
  • ZHENG GUANGMING
  • LI FANG
  • SUN HUALIN
  • Hu Panjin
  • GAO XIANHONG

Assignees

  • 宜都兴发化工有限公司

Dates

Publication Date
20260508
Application Date
20230905

Claims (7)

  1. 1. The application of the flotation inhibitor for phosphogypsum whitening and upgrading in phosphogypsum flotation is characterized in that the flotation inhibitor comprises inorganic inhibitor, small organic molecule inhibitor, polysaccharide inhibitor, polyphenol inhibitor and macromolecule inhibitor according to the mass ratio of (10-15) to (22-30) to (30-48) to (12-22) to (6-14), wherein the small organic molecule inhibitor is any one of citric acid, thioglycollic acid, oxalic acid, maleic anhydride and nonylphenyl tetraglycol ether, and the polysaccharide inhibitor is any one of aminoethyl starch, hydroxyethyl cellulose, carboxymethyl cellulose and methyl carboxylate guar gum.
  2. 2. The method according to claim 1, wherein the inorganic inhibitor is any one of sodium fluosilicate, fluosilicic acid, water glass and potassium dichromate.
  3. 3. The method according to claim 1, wherein the polyphenol inhibitor is any one of tannin, lignin, quebracho bark juice, wattle bark juice, and calcium lignosulfonate.
  4. 4. The method according to claim 1, wherein the polymer inhibitor is any one of polyvinylpyrrolidone, lecithin and alginic acid.
  5. 5. The method according to claim 1, wherein the flotation inhibitor is used in an amount of 0.05-0.2kg/t.
  6. 6. A process for preparing a flotation suppressant for whitening and upgrading phosphogypsum for use according to any one of claims 1 to 5, comprising the steps of: (1) Mixing polysaccharide inhibitor, polymer inhibitor and water in proportion, stirring and heating to obtain solution 1; (2) Weighing inorganic inhibitor, organic micromolecular inhibitor and polyphenol inhibitor according to a proportion, and uniformly mixing and stirring to prepare a mixture; (3) And (3) adding the mixture prepared in the step (2) into the solution 1 prepared in the step (1), and fully and uniformly stirring until the solid matters are completely dissolved, thereby preparing the flotation inhibitor.
  7. 7. The method of claim 6, wherein the temperature of the aqueous solution after the temperature is raised in the step (1) is 90-95 ℃, and the mass ratio of the polysaccharide inhibitor to the polymer inhibitor to the water is 30-48:6-14:300-480.

Description

Flotation inhibitor for phosphogypsum whitening and upgrading as well as preparation method and application thereof Technical Field The invention belongs to the technical field of comprehensive utilization of phosphogypsum bulk solid waste, and particularly relates to a flotation inhibitor for phosphogypsum whitening and upgrading as well as a preparation method and application thereof. Background Phosphogypsum is solid waste in wet phosphoric acid production, is a byproduct which is almost unused in phosphate fertilizer production, and belongs to dangerous waste pollutants. Because phosphogypsum contains chemical elements with extremely strong corrosiveness such as phosphorus, fluorine, free acid and the like, the rough stacking mode has negative influence on the environment, and the phosphogypsum is particularly characterized in that groundwater and surface water, soil and vegetation covers are polluted by substances penetrating into a protection screen, and disasters such as dust, landslide and the like can be brought. The prior art has the problems that the comprehensive utilization rate of bulk solid wastes reaches 60%, the stock is orderly reduced, but how to realize comprehensive treatment and recycling of phosphogypsum is always a worldwide problem, the phosphogypsum is mainly used for producing high-grade gypsum new materials with high yield, high hundred degrees and ultra-high strength, but the main problems in the production are that the phosphogypsum has more impurities and low whiteness, particularly the phosphogypsum produced by a wet phosphoric acid process has organic matters and organic flotation agents in concentrate pulp can be carbonized during sulfuric acid extraction, so that the phosphogypsum is black, further the color of subsequent products is influenced, and in addition, the phosphogypsum also contains organic impurities and a small amount of metal ion impurities such as silicon dioxide, iron, magnesium, aluminum and the like, and is generally light yellow, light gray or gray black, so that the whiteness is lower, and the difficulty of safe recycling of the phosphogypsum is greatly increased. As such, phosphogypsum is mainly used for cement retarder, paper plasterboard and the like which are still limited. The application advantages of the gypsum with high quality and high whiteness in building wall materials and functional fillers are becoming more obvious nowadays. Therefore, the development of phosphogypsum impurity removal and whitening technology research has important value for widening the application field of phosphogypsum and realizing high-value utilization of phosphogypsum. At present, there are many methods for removing impurities and whitening phosphogypsum at home and abroad, such as a calcination method, a flotation method, a leaching method, a bleaching method and a combined process of the above methods, wherein the flotation method is the most common method applied in the mineral separation industry, and can remove organic matters floating on the upper layer to achieve the aim of purifying and whitening, so that the method has wide application prospect in phosphogypsum impurity removal and whitening. At present, the phosphogypsum flotation is mainly concentrated in reverse and forward flotation, double reverse flotation and mixed reagent synchronous reverse flotation, wherein most reagents are researches on collectors, and less research on phosphogypsum flotation regulators is carried out, and Chinese patent CN115400881A discloses a phosphogypsum purification whitening method, which is characterized in that sulfuric acid is added into decolorized ore pulp to be used as a regulator, so that pH can be adjusted for flotation, and unreacted P 2O5 and metal oxides in phosphogypsum can be inhibited. Chinese patent CN115957888A discloses a phosphogypsum reverse flotation whitening and impurity removing agent, a preparation method and a process method thereof, wherein tributyl phosphate, terpineol, fatty primary amine (R-NH 2) with fatty alkyl (R) carbon chain length of C 12-C20 and dimethyl tertiary amine (R-N (CH 3)2) with fatty alkyl (R) carbon chain length of C 12-C20 are compounded to obtain the agent, so that the selectivity of organic carbon can be improved under an acidic condition, black organic carbon, iron impurities and silicon dioxide are captured. In summary, in order to improve the impurity removal and whitening effects of phosphogypsum in the flotation process, it is necessary to develop an auxiliary agent to assist in improving the capability of the collector, and to improve the quality of phosphogypsum, thereby increasing the comprehensive utilization rate of phosphogypsum and relieving the stacking pressure of phosphogypsum. Disclosure of Invention Aiming at the technical problems, the invention provides a flotation inhibitor for phosphogypsum whitening and upgrading, and a preparation method and application thereof, wherein the flotation inhibitor is pr